/Engine/Plugins/Runtime/GameplayAbilities/Source/GameplayAbilities/Public/AbilitySystemComponent.h
Allow events to be registered for specific gameplay tags being added or removed
[FOnGameplayEffectTagCountChanged](API\Plugins\GameplayAbilities\FOnGameplayEffectTagCountChanged) & RegisterGameplayTagEvent ( [FGameplayTag](API\Runtime\GameplayTags\FGameplayTag) Tag, [EGameplayTagEventType::Type](API\Plugins\GameplayAbilities\EGameplayTagEventType__Type) EventType )